Charles e



O. E. SCRIBNER.

ELECTRIC ARG LAMP.

(No Mdel.)

515,559,455 115555555 May 5, 1895.

EARANAM. M1010 Lmm. wASHxNGTDN. D.

UNTTED STATES PATENT Ormea.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO TIIE IVESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRlC-ARC LAMP.

.SPECIFICATION forming part of Letters Patent No. 559,408, dated May 5, 1896.

Application led January 9,1894. Serial No. 496,312. (No model.)

To @ZZ whom t may concern: My invention is represented in the accom- Be it known that I, CHARLES E. SCRIBNER, panying drawing, wherein I have shown a a citizen of the United States, residing at Chisimple form of open-circuit electric-arc lamp cago, in the county of Cook and State of Illiprovided with my improved cut-out.

5 nois, have invented a certain new and useful The arcelamp consists, essentially, of aiixed 55 Improvementin Automatic Cut-Outs AforArecarbon a and a movable carbon CZ, the latter Lamps, (Case No. SIZ) of which the followbeing carried upon a carbon-rod c, movable ing is a i' ull, clear, concise, and exact descriplongitudinally in journals in the lamp-frame tion, reference being had to the accompanyb. At one point the rod c passes through a 1o ing drawing, 'forming a part of this specilicaclutch CZ, which is suspended from a lever c, 6o tion. which I term the feeding-lever.77 This lever My invention relates to automatic cut-outs is iixed at one extremity to a flexible strap c', for electric-arc lamps. Its object is to proso as to be movable. A flat spring f has one vide a cut-out adapted to be brought into opextremity fixed upon the lever e and the other r 5 eration bythe descent of the movable carbon attached to an adjustable hook g, whereby a 65 to a predetermined point,in the consumption constant force is exerted upon the lever c, of the carbons, to create and maintain a short tending to raise it and through it the clutch circuit about the lamp. CZ, rod c, and carbon CZ. A bracket CZ is pro- My invention is especiallyv applicable to the vided beneath the clutch CZ, upon which the zo type of electric-arc lamps commonly known latter may bear when it has been permitted 7o as open-circuit lamps, in which the movte descend to a sufficient distance. Near its able carbon is normally raised from the fixed fulcrum the rod e carries an armature h, mov carbon bythe force of a spring, the approach ing before the poles of an electromagnet i. of the movable carbon toward the lixed car- The earbon-rod Z) is provided with a head bon, in order to create and regulate the arc, or collar b at its upper extremity, which is 75 being eli'ected by an electrcmagnet in shunt adapted to engage the free extremity of an of the carbons. In this type of arc-lamps it insulated pivoted switch-lever Zr when the rod has not heretofore been practicable to provide has descended to the requisite distance in a switch adapted to be actuated by the defeeding the carbon d as it is consumed. This 3o scent of the carbon-rod to close the eut-out position of the collar b is shown in dotted 8o circuit-as, for example, by a stud or collar lines in the drawing. upon the carbon-rod coming to bear upon the The switch-lever Zt is connected with feedswitch-sinee the moment the lamp is thus ing-lever e by means of an insulating-stud Z, short-circuited the carbon-rod is again raised fixed in the feeding-lever. The switclrlever 3 5 by the regulating' mechanism and the switch 7c is maintained in contact with stud Z by a 8 5 thereby opened. spring m. The stud Z is attached to lever e My invention is designed to avoid this difiiat a greater distance from the levers fulcrum culty. I provide aswitch spring or lever in than the point of support of clutch CZ, and the position to register with a collar upon the carstud Z bears upon the switch-levert at a point 40 bon-rod at a predetermined point in the path nearer the fulcrum oi the latter than the con- 9e el' the collar, and a connection between the tact-point which it carries. By this arrangecarbon-rod or the levers regulating and movment the contact point or surface of lever L ing with it and the switch-lever adapted to is caused to move through a greater range in move the switch-lever in the same direction following the movements o'E lever e than the 45 as the carbon-rod with pressure, whereby clutch CZ and the carbon-rod which it grasps. 95 when the lamp is cut outthe switch-lever is The circuit through the lamp is of the usual pressed against the collar on the carbon-rod character, the incoming or positive main beand'rises with it, thus maintaining the cuting connected with the carbon-rod l; or the out Contact. I am thus enabled to construct frame of the lamp and the other with the 50 a very simple and perfectlyeflieient cut-out. lower carbon a. rIhe magnet t is of high reroo sistance and is connected in shunt of the carbons. The switch-spring 7c is connected with the outgoing or negative main.

The normal position of the lamp is that indicated in the drawing, the carbon a being raised through the medium of carbon-rod b, clutch d, lever c, and spring f. Vhen current is first sent through the lamp, magnet t' is excited and attracts its armature h, lowering the clutch d until it strikes the bracket d/ and releases the carbon-rod b, thus permitting the carbons to come in contact. At the instant of their contact the lamp is short-circuited and the magneti is denergized, whereby the spring f is again permitted to raise the carbon a', thus forming the arc. The spring f is adjusted with relation to the strength of magnet i to maintain the desired length of arc between carbons a a in the usual manner.

Vhen, as the carbons are consumed, the rod descends until the collar D touches the eX- tremity of switch-lever 7s, a short circuit is formed about the lamp, extending from the carbon-rod Z9 through the switch-lever k to the outgoing main. Magnet t' is thus denergized and releases its armature h. The lever c rises, raising with it the rod Z) and the collar b thereon,but at the same time,through the stud l forcing the switch-lever 7c upward against collar b at a higher rate of movement than the clutch d, tends to raise the rod. rIhe rod is thus raised through the clutch, maintaining at the same time a firm contact with switch-lever 7s, thus preventing the rupture of the short circuit about the lamp.

It will be clear that other means might be adopted of communicating to switch-lever 7.; the desired movement with relation to the feeding mechanism or the feeding-lever of the lamp to attain the same general result, perhaps with equal efiiciency. I therefore do not limit myself to the form shown; but

I claim, broadly, as new and desire to secure by Letters Patentl. The combination with the carbon-rod of an electric-arc lamp, of a collar or shoulder thereon, a contact-point in the path of said collar to contact therewith at a predetermined point in the descent of the rod, and mechanism released at the moment of Contact between the said collar and contact-point, adapted to impel the contact-point in the direction opposite to the normal movement of the carbon, the collar being connected with one terminal of the lamp and the contactpoint with the other terminal thereof, substantially as described.

2. The combination with the carbon-rod of an electric-arc lamp, of a collar thereon, a contact-point in the path of the collar to raise the same, and mechanism connecting the contact-point with the feeding mechanism of the lamp adapted to move the contact-point in the same direction as the carbon-rod, the carbon-rod being connected with one terminal of the lamp and the said contact-point with the other terminal thereof, substantially as described.

3. The combination in an arc-lamp having a feeding-lever and a spring controlling the same to raise the carbon-rod, and an electromagnet opposing said spring in its action upon the feeding-lever, of a collar upon the carbon-rod, a contact-point upon which the collar is adapted to rest when the carbons are consumed, and a connection between the contact-point and the feeding-lever to move the contact-point in the same direction as the carbon-rod when the magnet is dcnergized, substantially as described.

4;. The combination in an electric-arc lamp having a feeding-lever actuated by a spring to lift the carbon-rod and having an electromagnet adapted to oppose the spring when energized, of a collar upon the carbon-rod, a contact-point in the path of the collar adapted to connect with it when the carbons are consumed, and mechanism connecting the contact-point with the feeding-lever, adapted to cause the contact-point to move through a greater range than and in the same direction as the carbon-rod, the said contact-point being connected with one terminal of the lamp and the carbon-rod with the other terminal thereof, substantially as described.

5. The combination with the carbon-rod, of a collar moving therewith, a switch in the path of the collar, a normally-excited electromagnet adapted to cause the movement of said contact in the direction of normal movement of the carbon, and a shunt of the said magnet controlled by the said switch-contact and collar, substantially as described.

In witness whereof I hereunto subscribe my name this 30th day December, A. D. 1893.

CHARLES E. SCRIBNER.

Witnesses:

ELLA EDLER, DUNCAN E. WILLETT.

IOO 

